Improvement in trial-squares



BURT & MILLER.

Square.

No. 66,946 Patented July 23, 1867.

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JOHN BURT AND A. M. MILLER, OF 'STURGIS, MICHIGAN.

' Letters Patent No. 66,946, dated July 23, 1867.

IMPROVEMENT IN TRIAL-SQUARES.

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TO ALL WHOM IT MAY CONCERN:

Be it known that we, JOHN BURT and A. vM. MILLER, of Sturgis, State ofMichigan, have invented certain new and useful improvements inTrial-Squares; and we hereby declare that the following is a true andexact description of the same, reference being bad to the annexeddrawings, and to the letters of reference marked thereon. in which-Figure 1 is a vertical longitudinal section, and

Figure 2 a side elevation.

The nature of our invention consists in having two blades a smalldistance apart, and filling the space with a. number of small slottedpieces, whose tops and bottoms shall be square with those of the blades,substantially as and for the purpose hereinafter described.

The fatigue consequent upon squaring a low surface with the ordinarytrial-square is very sensibly felt by all carpenters. To obviate thisdifliculty we propose constructing a square which shallindicate from thetop of the blades whether or not a given surface is relatively true orsquare.

A A represent blades let into the bandleB. A small space is left betweenthe blades in order to insert the slotted pieces e e e, which shouldwork easily in their places. The top and bottom of each pieceshould besquare with that of the blades. Said pieces are retained in their placesby means of small bolts or pins 2' i i, passing through the slots, asseen in fig. 1. Thus it will be observed that when the square is placedupon an uneven surface the pieces e e e will rest upon the lowerportions, as seen in fig. 2, and will indicate from the top of thesquare the true and'exact depressions, and thereby save the operator thetrouble and fatigue of bending down to ascertain the condition of hiswork from time to time.

Having thus fully described our invention, what we claim, and desire tosecure by Letters Patent, is-

The employment of slotted pieces e e e, substantially in the mannerdescribed, for the purpose of indicating at the top of the square thecondition of the work.

In testimony that we claim the above we hereby-affix our signatures inthe presence of two witnesses.

JOHN BURT, A. M. MILLER.

Witnesses:

JOHN B. Jscoss, MAGEY TOBEY.

